[PD] [vcf~] and [biquad~] filters
Dan Neveu
neveu at buffalo.edu
Mon May 17 20:09:18 CEST 2004
Do you have access to the Jimmies lib?
http://www.ircam.fr/produits/logiciels/log-compl/msp/Jimmies-e.html
I don't have them myself. I just know there're additional filters provided.
-dan
On Mon, 17 May 2004 julien.breval at tremplin-utc.net wrote:
> Hello
>
> In June I will participate to a concert in which we all have to use Max/MSP.
> Therefore I am currently porting some of my Pd patches to MSP, and I have some
> problems with bandpass filtering.
>
> In Pd, I use [vcf~]. I don't find any MSP filter that has a similar sound.
> With MSP filters like [svf~], [filtergraph] or [reson~], if you raise Q, you
> can still hear lots of frequencies that are only more or less attenuated. With
> [vcf~] some frequencies can disappear if you raise Q (actually, they are very
> much attenuated so you don't hear them). I prefer this sound.
>
> The right solution sould be to use [biquad~]. MSP-[biquad~] looks like Pd-
> [biquad~] with some arguments inversed.
> Unfortunately, besides a paper from Harmony Central I didn't find much
> information on it. Do you know any documentation about biquad filters ?
>
> How do you make the simplest (linear) bandpass filter using [biquad~]
> (parameters should be F and Q) ? I don't find any working conversion algorithm
> from (F,Q) to (bb1, bb2, ff1, ff2, ff3).
> I need something that resembles a '^' rather than a -90°rotated-'{', for any
> (Q,F) parameters :)
>
>
> Thanks a lot
>
> j
>
>
>
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